So I was on GB, and found a Sig Adaptive Carbine Platform. It ended Sat for about $100. The instructions said to print an invoice thru GB checkout and send a USPS MO. I did that Monday afternoon, and marked the entry with "Payment sent". About 2h later I got an email asking me to send to another address - same company name using the registered email address. I responded thru GB message that I had already sent funds to the GB registered address on the invoice. He told me that was the old address. Any suggestions on what I can do? Can I put a stop payment on a USPS MO?